Error Code P068C: What It Means & What To Do?

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Error code P068C can be defined as Cylinder 7 Glow Plug Control Circuit Low.

The Glow Plug is utilized on diesel engines to preheat the cylinder before the engine is started. Now if the engine control module would detect the glow plug for cylinder seven is not functioning properly, then the P068C would start appearing.

If the PCM detects a level of voltage, for the cylinder #7 glow plug control circuit that is outside the expected range, a code P068C will start triggering up and there would be an illumination of the check engine light on the dashboard.

What causes this problem with the Cylinder 7 Glow Plug Control Circuit Low?

• Malfunctioning glow plug timer
• Glow plug might be quirky
• Issue of opened or shorted glow plug control circuit
• Some defects in the glow plug connector

1. Body Control Module Component - Do you remember when was the last time you got your car Body Control Module Component checked up? A dirty Body Control Module Component can cause a lot of issues like displaying P068C code.
2. Glow Plug Connector - Poor Glow Plug Connector can cause a lot of difficulties, so why not get it replaced at time?
3. Engine Wiring Harness - Are there some faults in your Engine Wiring Harness? Don’t waste time and get them replaced or else P068C code can turn up.
4. Engine Control Module - OBD Code P068C can appear because of faulty Engine Control Module.
5. Powertrain Control Module - Everything is fine with Powertrain Control Module and still P068C code triggering? Then you must get your Powertrain Control Module checked.
6. Electronic Control Unit - There can be some issues with the Electronic Control Unit due to which you may see P068C code appearing over and over again. Visit us to buy best quality Electronic Control Unit online.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P068C code by mentioning some major symptoms below:

Common Symptoms

• Slow down engine starts up
• Diminishing fuel efficiency
• Immoderate black smoke from exhaust
• Engine drivability issues
• Some engine misfire codes may be stored

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P068C:

• If there are a few defects in the glow plug then it should be replaced
• Carefully inspect the glow plug timer
• Restore the opened or shorted glow plug control circuit
• The glow plug connector might be loose or faulty. So, you must get it repaired or replaced

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Here are some steps which you should follow in order to diagnose this fault code:

A suitable OBD-II scanner (or code reader) and a digital volt/ohmmeter will be most helpful in performing a successful diagnosis. Use the vehicle information source to search for applicable technical service bulletins (TSB). If you locate a TSB that matches the vehicle make and model, symptoms exhibited, and the code stored, it will help you to arrive at a diagnosis. You may also need to obtain diagnostic flow charts, wiring diagrams, connector face views, connector pinout charts, component locations, and component testing procedures/specifications from the vehicle information source

All this information will be needed to correctly diagnose the stored code P068C. Now once you have performed a careful visual inspection of all glow plug and glow plug control wiring and connectors, connect the diagnostic scanner to the vehicle diagnostic port. Then retrieve all stored codes and freeze frame data and record it for later

After that test drive the vehicle to see if the code P068C is reset. Drive until one of two things happens: Either the PCM enters readiness mode or the code is reset. If the code is reset, continue with the diagnosis. If it is not, you are dealing with an intermittent condition which may have to worsen before an accurate diagnosis may be achieved. Here is a tip that the service manual will not give you

The best way to test glow plugs is to remove them and apply battery voltage. If the glow plug glows bright red, it is good. If the glow fails to heat up, and you want to take time to test it with your DVOM, you will likely discover that it does not meet manufacturer's specifications for resistance. Be careful not to burn yourself or start a fire when performing this test. If the glow plugs appear to be working properly, use the scanner to activate the glow plug timer and test for battery voltage and a ground at the glow plug connector

If no voltage is present, test the power supply for the glow plug timer or glow plug controller. Test all related fuses and relays as recommended by the manufacturer. As a rule, it best to test system fuses and fusible links with the circuit loaded. The fuse for a circuit which is not loaded may appear to be functional (when it is not) and lead you down the wrong diagnostic path. If all fuses and relays appear functional, use the DVOM to test output voltage at the glow plug timer or PCM (wherever it originates). If voltage is detected at the glow plug timer or PCM, suspect that you have an open or shorted circuit. You may seek out the cause of the discrepancy or simply replace the circuit

Common Mistakes When Diagnosing The P068C Code

• Glow plug control module might be faulty
• There can be defective glow plug
• Malfunctioning glow plug wiring harness
• People think that a P068C cannot be caused by a defective glow plug because this is a control circuit code. Don't be deceived; a bad glow plug may cause a variation in the control circuit that result in just such a code
• Huge mistake of attempting to diagnose the wrong cylinder is made by a lot of people. Save yourself a big headache and make sure that you are addressing the correct cylinder before beginning your diagnosis